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Title:
METHOD FOR REDUCTION OF ALIASING INTRODUCED BY SPECTRAL ENVELOPE ADJUSTMENT IN REAL-VALUED FILTERBANKS
Document Type and Number:
WIPO Patent Application WO2004027998
Kind Code:
A3
Abstract:
The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.

Inventors:
KJOERLING KRISTOFER (SE)
VILLEMOES LARS (SE)
Application Number:
PCT/EP2003/009485
Publication Date:
May 27, 2004
Filing Date:
August 27, 2003
Export Citation:
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Assignee:
CODING TECH AB (SE)
KJOERLING KRISTOFER (SE)
VILLEMOES LARS (SE)
International Classes:
G10L19/02; G10L25/48; H03H17/02; G10L25/18; (IPC1-7): H03H17/02
Domestic Patent References:
WO1998057436A21998-12-17
WO2002080362A12002-10-10
Foreign References:
US6124895A2000-09-26
US5732189A1998-03-24
Other References:
N. GILCHRIST ET AL: "Collected Papers on Digital Audio Bit-Rate Reduction", AUDIO-ENIGEERING SOCIETY, no. 3.3, - 1996, XP002273511
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